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You are here : eLibrary : Ice Research and Engineering : 23rd Symposium USA (2016) : Ice in Lakes : Physical Conditions in the Water-ice Boundary Layer: from Lake Baikal to Small Arctic Lakes
Physical Conditions in the Water-ice Boundary Layer: from Lake Baikal to Small Arctic Lakes
Author : Kirillin, Georgiy B., Ilya A. Aslamov, Vladimir V. Kozlov, Nikolai G. Granin, Christof Engelhardt, and Josephin Förster
The vertical heat and mass transport across the water-ice boundary layer strongly affects growth and melting of the lake ice. The existing models of ice cover dynamics focus basically on the dependence of the ice thickness on the air temperature with implicit account of the effect of snow cover. The heat flux at the water-ice boundary, in turn, is usually neglected or parameterized in a very simplistic form. However, neglect of the basal ice melting due to heat flux at the ice-water interface produces appreciable errors in the modeled lake ice phenology. We analyze fine-structure observations taken in spring 2014 in ice-water boundary layers of Lake Baikal and arctic Lake Kilpisjärvi (northern Finland) to reveal the major physical drivers of the heat exchange at the ice bottom and to explain the high geographical, spatial, and temporal variability in the heat flux magnitudes. The new data provide first detailed estimations of the heat exchange beneath the ice cover, available previously only from bulk estimations. The fluxes in Lake Baikal have magnitudes of 101 Wm-2 and vary strongly between different parts of the lake beinginfluenced by large-scale horizontal circulation with current velocities amounting at 5-7 cm s-1. The shallow lake fluxes, while an order of magnitude weaker, arestrongly non-stationary, affected by the turbulence due to oscillating currents underice. Our results demonstrate the role played by the boundary layer mixing in the icegrowth and melting, as well as characterize the physical processes responsible for thevertical heat exchange and provide a basis for an improved parameterization of icecover in coupled lake-atmosphere models.
File Size : 1,136,178 bytes
File Type : Adobe Acrobat Document
Chapter : Ice Research and Engineering
Category : 23rd Symposium USA (2016)
Article : Ice in Lakes
Date Published : 20/10/2016
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